Henderson,+Charles

Rubidium

**History**  Rubidium was discovered in 1861 spectroscopically by Robert Bunsen and Gustav Kirchoff as an impurity associated with samples of the mineral lepidolite (a form of mica). The name rubidium (from the Latin "rubidus" - dark red) was coined for its bright red spectroscopic lines. Rubidium salts were isolated by Bunsen by precipitation from spring waters - along with salts of other Group 1 elements. He was able to separate them and isolated the chloride and the carbonate. He isolated rubidium metal by reducing rubidium hydrogen tartrate with carbon. Rubidium can be liquid at ambient temperature, but only on a hot day given that its melting point is about 40°C. It is a soft, silvery-white metallic element of the alkali metals group (Group 1). It is one of the most most electropositive and alkaline elements. It ignites spontaneously in air and reacts violently with water, setting fire to the liberated hydrogen. As so with all the other alkali metals, it forms amalgams with mercury. It alloys with gold,  caesium, sodium, and potassium. It colors a flame yellowish-violet. 


 * Common uses **

 Rubidium would not normally be made in the laboratory as it is available commercially. All syntheses require an electrolytic step as it is so difficult to add an electron to the poorly electronegative rubidium ion Rb+. Rubidium is not made by the same method as sodium as might have been expected. This is because the rubidium metal, once formed by electrolysis of liquid rubidium chloride (RbCl), is too soluble in the molten salt.

Ø **Atomic number 37 ** Ø **Non-metal **
 * Ø ****Properties **<span style="color: #0070c0; font-family: 'Calibri','sans-serif'; font-weight: normal; mso-ascii-theme-font: minor-latin; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; mso-hansi-theme-font: minor-latin;">
 * <span style="color: #0070c0; font-family: Wingdings; font-weight: normal; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings; msobidifontfamily: Wingdings; msofareastfontfamily: Wingdings; msolist: Ignore;">Ø ****<span style="color: #0070c0; font-family: 'Calibri','sans-serif'; font-size: 18pt; line-height: 115%; mso-ascii-theme-font: minor-latin; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; mso-hansi-theme-font: minor-latin;">Atomic mass 85.4678 **<span style="color: #0070c0; font-family: 'Calibri','sans-serif'; font-weight: normal; mso-ascii-theme-font: minor-latin; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; mso-hansi-theme-font: minor-latin;">
 * <span style="color: #0070c0; font-family: Wingdings; font-weight: normal; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings; msobidifontfamily: Wingdings; msofareastfontfamily: Wingdings; msolist: Ignore;">Ø ****<span style="color: #0070c0; font-family: 'Calibri','sans-serif'; font-size: 18pt; line-height: 115%; mso-ascii-theme-font: minor-latin; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; mso-hansi-theme-font: minor-latin;">Liquid **<span style="color: #0070c0; font-family: 'Calibri','sans-serif'; font-weight: normal; mso-ascii-theme-font: minor-latin; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; mso-hansi-theme-font: minor-latin;">

[|http://images.google.com/imgres?imgurl=http://students.hthcv.hightechhigh.org/~nwelch/My%2520Pictures/10_46_base_rubidium.jpg&imgrefurl=http://students.hthcv.hightechhigh.org/~nwelch/myspaceTemplate.htm&usg=__RgyWAlYX3WxGgMYtZnrvea6W_qk=&h=268&w=268&sz=7&hl=en&start=3&um=1&tbnid=Eu3wsO6niXyEhM:&tbnh=113&tbnw=113&prev=/images%3Fq%3Drubidium%26hl%3Den%26sa%3DG%26um%3D1] **<span style="color: #403152; font-family: Calibri; font-size: 22pt; line-height: 115%; mso-themecolor: accent4; mso-themeshade: 128; msothemecolor: accent4; msothemeshade: 128;"> http://www.webelements.com/rubidium/history.html
 * <span style="color: #0d0d0d; font-family: 'Times New Roman','serif'; font-size: 22pt; line-height: 115%; mso-themecolor: text1; mso-themetint: 242;">References **
 * <span style="color: #548dd4; font-family: 'Times New Roman','serif'; font-size: 18pt; line-height: 115%; mso-themecolor: text2; mso-themetint: 153;">[] ****<span style="color: #548dd4; font-family: 'Times New Roman','serif'; font-size: 18pt; line-height: 115%; mso-ansi-language: EN-US; mso-bidi-language: AR-SA; mso-fareast-font-family: Calibri; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin; mso-themecolor: text2; mso-themetint: 153;">